Ernest Raymond "Roy" John (3 December 1925 – 30 September 1981) was a Wales and British Lions international rugby union lock. He played club rugby for Crynant and Neath. John was capped 19 times for Wales and was a member of two Grand Slam winning teams. In 1950 he was selected for the 1950 British Lions tour to New Zealand and Australia. John was an agile runner for a lock, but was most notable for his excellent ability in line-outs.